The floating genie woman on the left was actually inspired by the flying vampire Marceline - floating people are actually amazing boons to artists as you can put them anywhere in any position.
And in inverse order, the warm up fan art. This pairing has taken over the internet briefly since the next clip of the show leaked, showing Marceline singing to Princess Bubblegum in a very... lovelorn manner. The fantastically Awesome Tom Siddell of Gunnerkrigg Court painted them as his very first Tumblr Post, so how could I not follow suit?
...and the original sketch, which I drew this morning. I had no eraser on me, as you can probably tell. I like Marceline's face - must try and tweak the painted version so her expression shows properly.